کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7896614 1510022 2013 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Corrosion processes of Mg-Y-Nd-Zr alloys in Na2SO4 electrolyte
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Corrosion processes of Mg-Y-Nd-Zr alloys in Na2SO4 electrolyte
چکیده انگلیسی
The corrosion behavior of Mg-Y-Nd-Zr (WE43 commercial alloy) was investigated in Na2SO4 electrolyte using potentiodynamic polarization curves, X-Ray Photoelectron Spectroscopy (XPS), Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) depth profiles, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectrometry (EDS) analyzes. SEM and EDS data show that Nd-rich precipitates are mainly located at the grains boundaries. Zr/Y-rich zones are distributed inside the most of the grains. XPS study indicates a depletion of Mg on surface that could be attributed to Mg dissolution and an enrichment of the addition element oxides. XPS and ToF-SIMS analyzes demonstrate that the corrosion films are made up of a magnesium hydroxide (Mg(OH)2) outer layer and an inner layer containing magnesium oxide (MgO), yttrium oxide (Y2O3) and hydroxide (Y(OH)3), mixed with a small amount of MgH2, zirconium oxide (ZrO2) and neodymium oxide (Nd2O3). The Y2O3 and Y(OH)3 signals increase slightly in the inner layer towards the corrosion film/alloy interface. Unlike these compounds, ZrO2 and Nd2O3 compound signals are constant inside the inner layer. It is concluded that: (i) neodymium, zirconium and yttrium play a key role in the slightly improved corrosion resistance of the alloy and (ii) the cathodic reaction is slower on WE43 than on pure Mg and AZ91.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 73, August 2013, Pages 196-207
نویسندگان
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